The invention discloses technology for preparing a composite package cushioning material from rice straw fibers. The technology comprises the following technological steps of: (1) pretreating, namely drying and removing impurities; (2) cutting up, namely cutting the rice straw obtained in the step (1) into straw particles with the diameter of 5 to 8mm, and mixing with partial fine rice straw fibers which are cut into the diameter of around 0.1mm and the length of 5mm; (3) performing surface pretreatment, namely soaking for 10 minutes by using aqueous solution of NaOH, filtering and drying for later use; (4) mixing, namely adding polymer into the mixed fibers subjected to surface treatment according to a mass ratio of 2-5:6-9, and adding a proper amount of mildew preventive and foaming agent for uniformly mixing; (5) molding, namely adding the uniformly mixed mixture into a mold, molding and demolding; and (6) drying. The invention also discloses a formula and technology for preparing 35 percent urea resin. The urea resin is a raw material for preparing the polymer in the composite package cushioning material prepared from the rice straw fibers. The technology for preparing the composite package cushioning material has the advantages of simple process flow and no side products. The produced finished product has the advantages of good degradation performance, good elastic resilience, high unit density and compression strength, and low density.